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Front case audio connections to ECS 755-A2 MBoard

K

KSmith

Junior Member
I'm now the proud owner of a home-built PC.
Key to the box is the ECS 755-A2 motherboard and the Ebuyer KG-168 Case with front panel audio ports. Everything works fine, but I'm having trouble connecting the case's front panel audio connections to the motherboard.

The case has two mini-phono jacks and provides the following 5 audio connectors:
a. Yellow L
b. Red R
c. Black GND
d. Green MIC1
e. Blue MIC2

The mboard has the corresponding AUDIO1 header with the following 10 pins:
(Info is from mboard manual. The case didn't come with a manual.)
AUDIO1: Front Panel Audio header
This header allows the user to install auxiliary front-oriented microphone and
line-out ports for easier access.
Pin Signal Name Function
1 AUD_MIC Front Panel Microphone input signal
2 AUD_GND Ground used by Analog Audio Circuits
3 AUD_MIC_BIAS Microphone Power
4 AUD_VCC Filtered +5 V used by Analog Audio Circuits
5 AUD_FPOUT_R Right Channel Audio signal to Front Panel
6 AUD_RET_R Right Channel Audio signal to Return from
Front Panel
7 HP_ON Reserved for future use to control Headphone
Amplifier
8 KEY No Pin
9 AUD_FPOUT_L Left Channel Audio signal to Front Panel
10 AUD_RET_L Left Channel Audio signal Return from Front Panel

How do the 5 case connectors match with the 8 active header pins?

Thanks in advance.
 
If I could find the motherboard manual I would run you through exactly which pin goes where, but unfortunately the ecs website has proved unhelpful, so the best thing I can suggest to you is to read through your MB manual and find the connectors section, it should detail _exactly_ where the different connections for ground / signals etc need to go 🙂
 
Thank you for being willing to help.
I apologize for my incomplete post.

My post included an excerpt from the manual pertinent to the front panel audio connections,
The complete manual is here.
 
If it helps,
the pinouts are the same on an ECS KT600-A
I don't have mine connected up.
Is there a jumper on 5/6 & 9/10 ?
 
Originally posted by: KSmith
I'm now the proud owner of a home-built PC.
Key to the box is the ECS 755-A2 motherboard and the Ebuyer KG-168 Case with front panel audio ports. Everything works fine, but I'm having trouble connecting the case's front panel audio connections to the motherboard.

The case has two mini-phono jacks and provides the following 5 audio connectors:
a. Yellow L
b. Red R
c. Black GND
d. Green MIC1
e. Blue MIC2

The mboard has the corresponding AUDIO1 header with the following 10 pins:
(Info is from mboard manual. The case didn't come with a manual.)
AUDIO1: Front Panel Audio header
This header allows the user to install auxiliary front-oriented microphone and
line-out ports for easier access.
Pin Signal Name Function
1 AUD_MIC Front Panel Microphone input signal
2 AUD_GND Ground used by Analog Audio Circuits
3 AUD_MIC_BIAS Microphone Power
4 AUD_VCC Filtered +5 V used by Analog Audio Circuits
5 AUD_FPOUT_R Right Channel Audio signal to Front Panel
6 AUD_RET_R Right Channel Audio signal to Return from
Front Panel
7 HP_ON Reserved for future use to control Headphone
Amplifier
8 KEY No Pin
9 AUD_FPOUT_L Left Channel Audio signal to Front Panel
10 AUD_RET_L Left Channel Audio signal Return from Front Panel

How do the 5 case connectors match with the 8 active header pins?

Thanks in advance.
Click to expand...

9 AUD_FPOUT_L Left Channel Audio signal to Front Panel = a. Yellow L

5 AUD_FPOUT_R Right Channel Audio signal to Front Panel = b. Red R

2 AUD_GND Ground used by Analog Audio Circuits = c. Black GND

3 AUD_MIC_BIAS Microphone Power = d. Green MIC1

1 AUD_MIC Front Panel Microphone input signal = e. Blue MIC2

The first 3 are definately right, as for the two mic connections you might need to swap them, can't tell you for sure, as long as the ground is connected you should be good.
 
Thank you so much for the help.
I will try it out tonight.

But what are the extra MB header connections for?

What is
4 AUD_VCC Filtered +5 V used by Analog Audio Circuits ?

and what are the return circuits for if you also have a ground?
6 AUD_RET_R Right Channel Audio signal to Return from Front Panel
10 AUD_RET_L Left Channel Audio signal Return from Front Panel
 
Originally posted by: KSmith
Thank you so much for the help.
I will try it out tonight.

But what are the extra MB header connections for?

What is
4 AUD_VCC Filtered +5 V used by Analog Audio Circuits ?

and what are the return circuits for if you also have a ground?
6 AUD_RET_R Right Channel Audio signal to Return from Front Panel
10 AUD_RET_L Left Channel Audio signal Return from Front Panel
Click to expand...

I believe it has to do with the fact that the headers on the board are setup according to Intel's Front I/O Connectivity standard.

I'm not sure, however I believe that they had this great idea that your front panel connections should remove the signal to your rear connections for your speaker ports on your mobo when you have (i.e. a set of headphones) plugged into the front port.

If this is the case, which I suspect as a possibility, you may not be able to use the front panel on your case, as it will not restore the signal to the rear connections when you unplug your speaker / mic devices from the front panel.

However like I said, this is just a possibility, might not be the case, I don't have that clear a memory, I remember reading about it sometime ago.
 
Well, I've done the deed.
First of all, I want to thank DannyBoy and GregANDTCH for their help.

I hooked up my 2 front USB ports aned they work fine.
I also hooked up my front audio ports as DannyBoy suggested.
Yes, there were jumpers across R & L signal & return.

The results were mixed, however.
Now the rear audio never works (as DannyBoy guessed) and the front audio is right channel only.
The R-L speaker tests result in a loud right and a soft right.
How can I have the rear audio active unless the front is pluuged in? (speqakers in back, headphones in front)
How can I get stereo in the front?
Am I asking for too much?
 
I think DannyBoy is right.
you may not be able to use the front panel on your case, as it will not restore the signal to the rear connections when you unplug your speaker / mic devices from the front panel.
Click to expand...
That's why the jumpers are on the 4 pins.
There're connecting the outgoing signal to the back ports.
When you have to remove them, you're interupting the signal to the back ports.
I wonder if a jumper wire would let you use both front & back?
The combined ohms might be a problem?

What happens if you switch the yellow & red wires?
Does the left channel work & not the right one then?

 
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